Table 2. Distribution of the variables related to the surgical anesthesia and their association with signs of SSI. São Paulo, SP, Brazil, 2014.

Variables		n	Mean± Standard Deviation	Median	Minimum- maximum	p-value
Preoperative hospital stay (days)			107.4±88	84	0-553	0.23*
Surgery time (minutes)			391±130	360	235-950	0.93*
ECC time† (minutes)			125±60.1	15	63-467	0.36*
Transfused blood component						0.34‡
	Concentrated red blood cells	60	2.5±1.3	2	1-6
	Fresh frozen plasma	31	3±1.6	3	1-9
	Platelets	22	5.7±2.7	6	1-12
	Cryoprecipitate	13	6.6±3.1	7	1-11
	Albumin	12	2.2±0.9	2	1-4
	Prothrombin complex	21	2±0.7	2	1-4

*Mann-Whitney-Wilcoxon test

†ECC: Extracorporeal Circulation

‡Fisher's exact test